Mesoporous Carbonized Materials from Polysaccharides
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Solution Overview
Problem
Current methods for producing mesoporous activated carbons are energy-intensive, wasteful, and often use non-sustainable materials, limiting their application and stability, especially in liquid phase and biomedical uses where high mesoporosity and controlled bulk and surface structures are required.
Innovation Solution
A method involving thermal treatment of expanded polysaccharides with acidic functionality, such as alginic acid, to create mesoporous carbonized materials with controlled pore structures, allowing for the formation of stable mesoporous structures and functionalization for various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional thermal treatment of native polysaccharides is used, then carbonized materials are produced, but the materials exhibit high microporosity and limited control over bulk and surface structures
Solution Approach 1:
The polysaccharide is pre-treated through thermal hydration to form a gel structure, followed by recrystallization and solvent exchange to create an expanded mesoporous precursor before carbonization. This preliminary structuring enables control over the final carbonized material's bulk and surface properties while reducing unwanted microporosity.
Solution Approach 2:
The invention employs controlled thermal treatment at specific temperature ranges (100-300°C) rather than conventional high-temperature carbonization. This parameter change in treatment temperature, combined with controlled atmosphere and duration, transforms the polysaccharide structure to achieve desired mesoporosity and surface characteristics.
2Manufacturing precision
If multi-step template methods are used for preparing mesoporous carbons, then mesoporous structure is achieved, but the process becomes energy-intensive and wasteful
Solution Approach 1:
The polysaccharide itself serves as the carbon source and structure-forming agent throughout the process. Through thermal hydration, recrystallization, and controlled carbonization, the material self-organizes into mesoporous structures without requiring external templates, eliminating the need for template synthesis, carbon source impregnation, and template removal steps.
Solution Approach 2:
The invention extracts and eliminates the template-based intermediary steps from the conventional process. By directly converting pre-structured polysaccharide to carbonized material through controlled thermal treatment, the method removes the unnecessary inorganic template and its associated synthesis and removal operations.
3Manufacturing precision
If synthetic organic polymer precursors are used, then mesoporous and shaped activated carbons can be prepared, but the materials are not environmentally sustainable
Solution Approach 1:
The invention uses natural polysaccharides instead of synthetic polymers as precursors. By controlling thermal treatment parameters (temperature, atmosphere, duration) and pre-treatment conditions (thermal hydration, recrystallization), the method achieves the same mesoporous and shaped carbonized products from renewable, biodegradable, and non-toxic polysaccharide sources.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces mesoporous carbonized materials with high mesoporosity and low microporosity, enabling stable and efficient use in applications like chromatography, catalysis, and water treatment, while being environmentally sustainable and reducing energy consumption.
Implementation Method 1
The thermal treatment results in a carbonisation, or a partial carbonisation, of the polysaccharide
Implementation Method 2
subjecting said expanded polysaccharide to a thermal treatment of from 100°C to 300°C
Data Source
Figure 1A~1Biii
Figure 2
Figure 3~4
AI summary
A mesoporous material is derived from a polysaccharide by thermally assisted partial carbonisation after expansion. The polysaccharide is an acid containing polysaccharide or mixture of polysaccharides.